Silver is a precious metal in a relatively cheap metal. In the industrial and daily life in a very wide range of uses. With the great relevance of the industry, is both a high-tech metal, is also a kind of army, the dual-use metal. This article focuses on the Bank's 10 main areas.

1.


Silver halide photosensitive materials are silver-halide photosensitive materials, including silver chloride, bromide silver for the photosensitive material, they will be dispersed in the gelatin medium-ceramics Formed in the photographic emulsion, and coated in support of (film or paper-based) from. Different uses of silver halide photosensitive materials required for the different particle size is usually shared the silver halide crystallite size for the 0.2 2 μ m; special purpose film
use of silver halide particles Crystal is ultrafine particles, the size of 0.01! 0.1μ m; holographic silver halide photosensitive materials shared the silver halide crystallite size for the 0.03 0.08 μ m; to improve milk
photosensitive agent-resolved, and the diffraction efficiency And the sensitivity of the laser, the production of the T - particles emulsion, not only refers to a flat sheet silver halide particles, T - particles in the thickness of 0.3 μ m less than morphology (3.5
Tablets diameter and thickness ratio)> 8, typical T - particle shape than> 20 in the T - particles of silver in extremely difficult to achieve Good dispersion. T - particles has the advantage of large surface area can change
photosensitive layer thin, with less silver. Suitable for different needs, have developed a variety of shapes and a variety of internal structure of silver halide-ceramics.

Silver halide photosensitive materials is the largest silver one of the areas. Currently the largest production and sales of several photosensitive material is photographic film, paper, medical X --ray film, industrial X --ray film, microfilm, fluorescent information documentary, photographic film electron microscope Tsim film and printing. 20 90 in the century, the world silver photographic industry with some of the 6000 6500 t, medical
X --ray film (including CT Elements) than for industrial use X - the output of large-ray film 10 times, microfiche also increase the amount.

As electronic imaging, digital imaging, numerous inconsistent with the development of printing technology, it's traditional silver halide imaging technology by the impact of challenges, such as the impact of a television movie. At the same time non-silver photographic material in the printing industry, the paper copy, audio-visual industry, such as the emergence of new and high technologies, so that silver halide photosensitive material consumption has decreased, but the silver halide photosensitive materials used in certain areas can not replace
, There is still great market space.

Silver halide photosensitive materials of the large number of applications to become the second-and the source of resources, such as the medical X - Optical Film Archive need, in some countries provides children X - - Film should be saved to adult, a lot of these film of silver, the only major U.S. hospitals kept by the X - Film-occupation of the estimated volume of silver reached 3000 4000 t. Use of microfilm technology can save with silver.

2. Decorative materials


attractive white with silver luster, the visible light reflection rate of 91%, by the people (especially women) in favor," Women have the reputation of the metal". Silver their beautiful colors, a high chemical stability and collectors ornamental value, widely used as jewellery, ornaments, silverware, dishes, King-gifts, medals and commemorative coins.

The most commonly used decorative silver-based alloys have Ag-Cu alloy, Ag-Pd alloy, and by adding a small amount of other elements of hardened silver metal alloy. Ag-Cu alloy content from the Cu wt
7.5 to 2.0. In the United Kingdom, also known as the 925 Sterling silver alloy Sterling Silver with Cu for the 7.5 percent, is the only currency alloy, Jewelry is alloy. Ag
Cu10% a gold 900 alloy) as the currency silver and jewelry in general use 800 or 800 over the alloy. Ag-7.5 20% Cu The alloy can also make tableware. Low palladium jewellery in silver alloy
by adding a small amount of Au or Pt to increase corrosion resistance. Adding Cu Zn Sn can be improved and can be cast. Ag in the net by adding Mg Ni and so on, then proceed to the oxidation can
hard alloy, silver and maintain the purity of 99 percent or more. Au increase the Ag and Pd a silvery alloy alloy. To Ag as the base, plus 10 20 percent of the Ni or Zn, 12% the Pd can also have a ""
Platinum alloy.

Metal or alloy it depends on the colour of the reflectivity of the incident and the frequency of (energy) the relationship between. Ag and Au are similar to the electronic structure, you can expect in the Au-Ag a in the band structure of the same, but the d can And the Fermi level with the energy gap between the Ag With the increased content and continuous increase, and this gap can control the width happens to be the color of the band-yue
move the decisive factor. Cu and Au the electronic structure similar to, Ag is Au-Ag Au-Ag-Cu and Au-Ag-Cu - Zn and K an important component in the alloy elements. In Au-Ag
alloy, with the Ag in different will be entitled to campaign colors, including Ag When amounted to 70 at% (56wt %) When it will become a white alloy.

Silver jewelry in developing countries still have a vast market, silver tableware has welcomed the family.

Currency since gold and silver from the position after the withdrawal, statutory Mint also withdrew from the stage of history, but as a commemorative coins are still very prevalent, is the issue of commemorative coins to mark the national and world events, history People, Places, rare animals and plants, such as the contents of the statutory issue of coins. Design exquisite commemorative coins, issued less than with preserving and increasing the value-added functions, by coin collectors and coin investors
the Green Mi. 20 the 90 with the Mint silver remained at 1000 1500 t from top to bottom, accounting for the consumption of silverabout 5。

3.

Electrical contact with industrial materials used silver is one of the largest electrical contact materials.

Currently, the world silver and silver-based materials, contact the annual output of about 2900 3000 t. Contact with all countries in the world of brands has been more than several hundred, everything. On the one hand, is due to a modern industrial materials exposed to an increasing demand for the results of the other countries and their own resources on the case. Some grades improved, add some new elements on the actual
has become a trademark of the alloy.

In silver and silver-based electrical contact materials, although many brands, but can be summed up, can be divided into: a) pure Ag 2) Silver Alloy 3) Silver - oxides 4) sintered alloy. Currently the largest production and consumption of electrical contact materials are Ag Ag-Au AgPd AgPt AgMg AgSn AgCa AgMn AgCu AgCe AgCd AgC AgW
AgFe AgNi And so on and their respective multi-alloy and Ag-Me0 and other products.

Because of China's rare earth rich in natural resources, 20 70 in the century by the author in the country take the lead in the successful development of the Ag-Ce0.5 alloys are widely used And from this development triggered a series of domestic rare earth with a silver-based electrical contact materials.

Ag-Cd0 electrical contact material is the most representative of the middle-load materials, as Cd toxic, and thus the development of a series of other Ag oxide materials, until Note there are still people Ag-SnO2 material development (including internal oxidation, reduction and melting in situ, hot pressing reaction, mechanical alloying reaction, etc.).

Reduction Act (including electroplating) of electrical contact materials is a key technology of silver, that is, in contact with key parts used silver and silver alloys

4. Composite
Bank of composite materials through the complex process of a combination of new material. It can retain Ag and the substrate and the main character, and through the combined effects of the components were not available in performance, complement each other and each other into consideration and the silver used in key positions, is an important festival Silver, silver composite advanced materials have become a modern major categories.

Industrial application of composite materials containing silver can be divided into two categories: a) silver and silver alloy and other metal alloy composite materials (including surface-and mosaic-and-rivets, wrap ); 2, and so on) to the silver-based metal matrix composites (such as Ag-Mey0x Ag-C fiber, not each other elements of the melting of sintering).

First composite materials are silver copper, silver brass, silver cerium copper, silver cerium brass, silver cerium Zinc white copper, silver copper and nickel bronze, silver copper brass, silver-bronze copper, gold, silver platinum bronze, Palladium silver zinc white copper, silver copper copper-nickel, copper and iron silver copper, silver copper Cu-Al cobalt zinc, silver copper Copper-aluminum nickel zinc, silver copper Copper-aluminum iron, silver copper copper chromium zirconium magnesium, silver zirconium cerium nickel copper
Lvtie titanium, zirconium silver cerium Gadolinium copper and nickel zinc, nickel Jinyin Tong copper, zinc Nickel Beryllium Bronze Jinyin Tong, the silver copper, gold/ Nickel-silver-gold copper and nickel, nickel-silver-gold the, such as copper and nickel.

Second type of composite materials are Ag-Cd0 Ag-Sn02 Ag-Zn02 Ag-Fe Ag-Ni, Ag-W Ag-C Ag pottery, ceramics and other materials.

Of silver from the technical perspective, silver is a class of composite materials much of the future development of new materials.

5. Silver alloy solder
silver in the industrial alloy, silver brazing alloys of a door type, a wide range of applications, are widely used in all kinds of steel, stainless steel, nonferrous metals Such as welding; special ingredients in the group of silver-based solder can also be used for welding tungsten, carbide, diamond, ceramics, carbon and glass. Welding problems (such as titanium and gold, dispersion strengthened alloy and alloy hardness, etc.) can be used
solder
access technology solutions, such as ceramic components Si3N4 Zr02 And the diamond, such as welding could achieve welding. In a special silver brazing alloys make ceramic welding can be achieved easily, without first of metal materials.

The traditional Ag-Cu a welding alloy series: Ag-Cu Ag-Cu-Sn-In Ag-Cu-Zn, Ag-Cu-Zn-Cd Ag-Cu-Zn-Sn-In Ag-Cu-Zn-Cd-Ni-Mn-In; Ag-Cu-Zn-In - Mn-Ni Ag-Cu-Zn-In-Ni Ag-Cu-In-Sn-P and so on. One Ag-Cu28 is the largest amount of power vacuum solder.

In addition, Ag as a free add-in Au alloys and solders Cu alloy solder also been widely used. Au and Ag can be in liquid and solid unlimited inter-rong, and because of its liquid-phase of a very narrow temperature range and can be used as solder. Ag volume of the 20 40 percent of the Au-Ag solder alloy its melting temperature (liquid temperature) between the 950 1050 ℃, with excellent electrical conductivity, thermal conductivity and corrosion resistance. Au-Ag-Cu solder alloy components of a very wide distribution, which ranged from Ag in a 35 percent of its melting point (solid-state temperature) between 780 ℃ 950 ℃. Solder in copper alloy in the Cu-Ag-P Cu-P-Ag-Sn, liquidus temperature ranged from 925 683 ℃ between In the gold ornaments in the solder alloy often without the use of add Ag. Color K gold alloy solder, including Au-Ag-Cu (Zn Sn In Au-Ag-Ge-Si such as the Department of platinum and K gold alloy solder in the Au-Ag-Cu on the basis of the bleaching agents and add the melting point and improve regulation Solder the non-performance of components. Welding Alloys

the direction of development is mainly in the solder removal of environmentally harmful elements, saving precious metals and special purpose welding alloy.

6. Silver slurry
With the rapid development of the electronics industry, Silver is the manufacture and development of electronic components, thick-film hybrid circuits and components touch the basis of material, 20 80 in the century since, as Surface Mount Technology SMT) the emergence of multi-layer thick-film hybrid technology has become the mainstream of microelectronics technology, touch components come to the fore, so that a silver paste in the e-slurry A wide variety of
Damian-products. The current world demand for pulp in 4000 tons or more, the output value of about 100 100 million U.S. dollars. Development of China's pulp

20 from the 60 the beginning, when the major development of foreign military by banning the export of pulp, 80 the late 1990s, the reform and opening up from abroad The introduction of many of the production end, to the pulp production based on domestic and challenges of opportunity. Has been developed by Silver: Silver hotline car glass, vacuum fluorescent display with Silver, solid tantalum capacitors
with special Silver, Silver dedicated semiconductor ceramic capacitors, resistors used in pressure-sensitive silver conductor slurry , Piezoelectric beep-Silver, metal and non-metallic applicable to the mutual bond between the silver conductive plastic
apply to the low-temperature curing silver paste, apply to the positive temperature coefficient of thermal resistance used in the silver - Pulp, for the piezoelectric ceramic resonators, filters, and other areas of high temperature Silver, for monocrystalline silicon or polysilicon solar cells
back electrode Silver and silver aluminum paste for the thick-film hybrid IC multi-electrode wiring and components of the slurry silver palladium, used as membrane switch, and other fields, such as polymer
slurry. With China's accession to

WTO, foreign electronics companies continue to move into China, Taiwan's electronics industry has rushed to the mainland, for Silver is continuously expanding, in which symphonic competitive situation, Silver in the quality of domestic and Silver production must be resolved in mass production, stable performance, high-quality, affordable, variety sale, and other aspects to make efforts.

7. Energy industry with silver
1 Silver - zinc batteries. Power in the chemical, silver - cadmium batteries, silver - iron batteries, silver - Magnesium batteries and silver - zinc batteries. At present, the application is silver - zinc batteries, zinc - silver oxide battery. Such batteries Ag2O or AgO for the cathode, the anode zinc, potassium hydroxide as the electrolyte. In 20 90 in the century of silver - the production of zinc batteries, the U.S. annual consumption of silver about 40 tons, it is estimated that the consumption of silver in the world in the 100 tons or more, Silver - zinc batteries in aircraft, submarines, buoys, missiles, spacecraft and ground-based electronic instrumentation and the eldest is no special
use, the trend has always been and can constantly stay focused.

2 fuel cell. Hydrazine - air fuel cell cathode by the silver nitrate solution is impregnated with activated carbon to the processed and activated carbon silver + PTFE catalytic electrodes. In the solid oxide, zinc batteries, Ag-(La0.7Sr0.3) Co03 and Ag-(La0.7Sr0.3) Mn03 metal-ceramic film is SOFC for the Selection of the air electrode material.

3 fast ion conductor. Fast ion conductor is a kind of liquid electrolyte conductivity and can be compared to the molten or solid ion conductor, also known as solid electrolyte. Principal conductor of the silver ions are α-AgI RbAg4 5 Ag2O Ag2SeO4 Ag2Mo04 AgPO3 and AgI-Ag20-Se03-Me03 AgI-Ag20-Mo03 fast-conductive, such as glass, can be used for high-energy density of power, more mature silver iodine battery is the Ag / RbAg4 5/RbI3 - C and so on.

4 the use of solar energy. Silver use of the high reflectivity for solar condenser. Solar Battery Silver, silver aluminum, such as pulp.

5 nuclear energy. AgInCd is an important alloy of neutron control rod material. Pd-Ag Pd-Ag-Au-Ni multiple hydrogen purification materials can be used for thermal diffusion of hydrogen and oxygen purification devices and nuclear fusion reactor in the H2 isotope separation and purification of

8. Silver in the catalyst in the application of
catalytic technology is the basis of the development of chemical industry of one of the key technologies. GDP in developed countries the national economy% 30 20 percent directly from catalyst. Silver in particular catalyst in many applications. If
Ag/Al2O3 Yixi for the manufacture of ethylene oxide, or ethylene glycol. Silver catalyst into the ethylene oxide manufacturing polyester fiber used in the manufacture of insulation by days of sweaters, scarves, jackets, shawls and other popular material for making.
KBr-Ag-Al3O3 as butane Dehydrogenation of butadiene. Ag
metal and Pd catalyst composed of formaldehyde can greatly improve the production. DuPont used
Ag-Au net for the formaldehyde air oxidation Dehydrogenation of formaldehyde.
Ag / zeolite catalyst for formaldehyde, acetic acid, nylon, acetaldehyde, anthraquinone, and other workers to produce, including yttrium Y) of the silver catalyst can be used to improve and improve The aromatic spices and food, dental
cream, chewing gum and cigarettes and the smell of the synthetic drug.
Silver catalyst can be used to deal with industrial emissions of sulfur compounds.
Containing silver catalyst can be used in the manufacture of benzene and even high-octane fuel.
Silver catalyst can be the H2 and CO2 synthesis gas into methane and ethanol (Motor Vehicle Fuel). X
silver zeolite can be used as gas dehydrogenation deoxy.
Silver metal oxide catalyst can be organic as CO2 and water.
In silver catalyst can achieve isopropanol dehydrogenation catalyst manufacturing acetone. Silver dehydrogenation catalyst to amine production nitrile RCN). Silver compounds widely used as a polymerization and oxidation and reduction of the catalyst.
Silver nitrate can be prepared by acrylamide-oxygen inner ring. Perchlorate can be used for the silver dimethyl for formyl production of the polymer resin-butyl acrylate and methyl acrylate for the realization of the amide polymerization.
Silver tetrafluoroborate propadiene amine can be used for synthesis of the Ring 3 --pyrrole. Silver alone or carbonate to load the acetyl plastic Celite), to achieve D - fructose, ethylene, propylene and C sugar
α - the glycol methyl Oxidation. Silver sulfate can be aromatic hydrocarbon compounds reduced to cyclohexane derivatives, it can also be used for oxidation of organic matter in waste water samples of chemical oxygen demand
COD). Pd-Ag thin catalyst has broad purposes: as Pd-20Ag can be used for 2 - anti-butene dehydrogenation the conjugation reaction, toluene or benzene hydrogenation from methanation The hydrogenation Pd-23Ag can be used for cyclohexane
hydrogenation. Pd-25Ag hexane dehydrogenation widely used in the conjugation reaction of hydrogen and the oxidation; isoamyl diene between the hydrogenation of 2 - methyl - a - butene;2 4 - diene
and a 5 - diene of ethylene, styrene of ethylbenzene, acrolein reduction of propionaldehyde - Urea; Central has dehydrogenation; n butane dehydrogenation of a - butene and isobutane Preparation of dehydrogenation
butene; 1, 3 - and a butadiene - butene of butane, and other hydrogenated. Pd-35Ag will have en-hydride. Pd-40Ag, Pd-50Ag will cyclohexane dehydrogenation.


9. Silver in the medicine of
A. silver in the medical application of biomedical materials

different from the drug, its main purpose is not treated through the body Chemical reactions or metabolism to achieve, but must meet the requirements of biology, that is biocompatible. Silver in the medical application than the more.

A) with silver surgery: acupuncture with Yinzhen, Silverstrand suture wounds and bone connective tissue, silver drainage tube. Silver alloy used for bone replacement (especially the skull). Silver foil covered apply fresh wounds to accelerate the opening up of wound healing. Ag-Pd alloy widely used in the optic nerve repair devices, ear foil nerve stimulation devices, incontinence, with the spinal cord to stimulate home, children with spinal cord, such as bending devices. The use of electric stimulation Electric Biostimulation) with silver to promote the growth of bones and skin, and so on.

2) dental materials. Casting can be divided into dental alloys and dental amalgam. Casting a silver-based dental alloys: Ag-Cu-Sn Ag-Cu-Sn-Zn Ag-Cu-Zn-Ni
Ag-Pd , Ag-Pd-Au Ag-In-Zn-Pd and other materials. Ag-Pd for the mouthpiece, the short span of the bridge teeth. Dental Amalgam Alloy is filled with dental repair materials. Old-fashioned Ag
Sn Amalgam Alloy no longer in use, is the use of Ag-Cu-Sn amalgam, made of spherical alloy powder and irregular powder mixed use, this mixed powder more Reclamation of a strong and better
carved for viscosity. Lead high-alloy powder and mercury-free dental filling materials (such as Ag-Ga-based alloys, gallium alloy) by the people's attention.

3) silver in the diagnosis and analysis are applied. Silver staining technology in the diagnosis of the GUI is useless, its Loumin degree than with other methods to raise 100 times. Silver can be used in the diagnosis of fetal malformation during his lifetime and pathological monitoring, physiological changes in disease, the diagnosis of genetic disease chromosomes, hormones and urine levels of peptides in the identification and assessment of drug treatment, can also be used for natural food on the day
Analysis. Silver protein analysis can provide a clear image with? Quot; fingerprint protein" to make identification of other proteins. Silver complexes can be used for observation of human cells and the construction of the smallest pieces,
Instructions for the diagnosis of cancer and multiple sclerosis presence of antibodies by electrophoresis to accurately identify the abnormal protein.嗜silver nitrate used in the diagnosis of early breast cancer estrogen. Made with Ag
Film used to determine the concentration of glucose in urine, the urine of grain for diagnosis. Adopt Ag / AgCl electrodes can be made from biological sensors used to measure syphilis and measurement of blood type and antibodies in the blood
The O2 CO2 the concentration of value and PH

4) CO2 silver halide fiber laser scalpels. Silver halide Polycrystalline fiber [AgClxBr (1-x)] (0 ≤ X ≤ 1) a good signal and infrared spectra of the infrared laser energy performance. China's recent successful development of the silver halide fiber CO2Laser scalpels in the mouth, throat, gynecology, and anorectal in areas such as clinical application. Completion of clinical application will enter the stage of industrialization

(5) Medical Imaging X-Ray film, CT film, magnetic resonance imaging films

B. silver in the application of drug

a) of silver in traditional Chinese medicine: A number of Chinese medicine Formula in silver foil. Some herbs also contain no trace of silver, such as the Health and astragalus for the content of the Bank of China 4.615 μ g / g

2) soluble silver : Citric acid such as silver nitrate and silver. The most commonly used soluble silver is silver nitrate, which can be used as convergence, there are provocative or caustic medicine, and its role with deep concentration and duration of the relevant, solid bar of silver nitrate (With 1 3 AgCl) or different concentrations of silver nitrate solution, can be used for removing warts, which repeat, in the bud, and so on. Citric acid silver can
For the treatment of burns and skin diseases. The use of 1 percent of the silver nitrate solution Diyan, the eyes of newborns to prevent Streptococcus suis infection was mucosa

3) insoluble compounds: Such as oxides, halide salt (oxides, iodide). Colloidal silver can be used to make governance Wen burn ointment and skin infections

4) and silver sulfadiazine acid fluoride faction Silver: This is a major medical silver compounds. Wen burn in the governance and African sleeping sickness

5) Silver Sol: If AgI (Neosilvol) colloidal solution and Strong protein Protargol (Strong) and Softbank protein Argyrol (mild) and Crede plaster (with the silver) can be effective as a local anti-infective agents. Colloidal silver For gynecological washing disinfection sterilization

6), a silver ion technology EGSI). The experiments proved that for all types of bacteria, Gram-positive bacteria, Gram Portland-negative bacteria and all kinds of aerobic bacteria, anaerobes were obviously the effectiveness of anti-infection with broad-spectrum antimicrobial activity


10 Silver Series antibacterial materials

Silver Series antibacterial material is a kind of inorganic antimicrobial material. Inorganic materials with antibacterial silver persistent, lasting and broad-spectrum, heat resistance, and safe and difficult to develop resistance to the characteristics of

Silver series of major anti-bacterial silver Ling-apatite, zirconium phosphate sodium silver, silver zeolite, silicon sodium borate silver, titanium dioxide silica

silver copper and other materials containing silver engage in bacteria A wide range of applications can be developed many useful products

a basic group is divided into zirconium phosphate sodium silver antibacterial material, including the scope of its application: PE PP antibacterial ABS such as film products, refrigerators lining, washing machines lined, engage in anti-mildew of packaging materials, anti-bacterial ceramics, bidet, a washbasin, toilet, tile, paint, magnetic teeth enamel antibacterial products, containers , Utensils, food containers, etc.. Silver zinc zeolite. Fiber can be used for anti-bacterial products, non-woven fabrics, underwear, footwear, motor vehicles, aircraft upholstery, medical show Bai Dagua, such as bed sheets. Antibacterial PE PP ABS products such as film, PE aluminum products such as films such as sodium borate

silicon silver. Bacteria can be used to engage in PE , PP ABS and other film products, glass products antimicrobial, bacteria engage in fiber products, antimicrobial paper, silk, and other

titanium dioxide silica-copper. Soil available Fungicide

silver Ling-apatite. Fangjun can be used for anti-mildew PP PVC PE and other film products, ship decor, industry cycle Fangjun water projects, such as coating

triazolam silver, silver thiosulfate salicylic acid and glycyrrhizic acid silver compound also has a good antibacterial effects of sterilization

inorganic antibacterial agents are elements, elements Ion and functional groups engage in sexual contact with the bacteria such as: Ag Cu Zn S As and Ag Cu2 + and SO32 AsO2 and so on. Element of the so-called Ag micro-dynamic effect Oligodynamiceffict) can kill contact with the bacteria, fungi, spores and fungi , And other microorganisms. Variety of metal ions have a role of anti
, and its role order of

Ag> Hg> Cc> Cd> Cr> ; Ni> Pd> Co> Zn> Fe

but Hg Cd Pd Cr have on the human body Residue of poison, Ni Co and Cu objects from a stain on the role and should not be used in fiber, commonly used in the practice of peacekeeping metal antibacterial agents is Ag, Zn and its compounds. Silver antibacterial activity and its valence of the state, this ability in the following order decreasing speed

Ag3 +> Ag2 +> Ag

High-reduction potential of silver high, the space around it can produce atomic oxygen and has antibacterial activity. Ag + strongly attracted to bacteria in the eggs of sulfhydryl, and quickly, putting the necessary enzyme that the loss of activity, Caused the death of bacteria, the mechanism is as follows
SH SAg
enzyme 2Ag + of 2H +
SH SAg

newly Shanghai Boer BOE) health Clothing Co., Ltd from the United States BOE authorized the use of BOE international brands, In a professional production of the United States BOE high-tech health-care apparel. BOE in a series of health costumes, all sectors of the community immediately expressed strong interest in

series of anti-bacterial silver material may form a major industry